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Old   June 21, 2005, 11:10
Default CCM+ Natural convection
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AJ
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CCM+ HELP! I'm trying to simulate natural convection from a heated fin into air. The air density and temperature around the fin vary as expected, but there seems to be no air movement. The model is setup with a solid continuum and a fluid continuum. The model for the fluid is as follows: Steady, Laminar, Segegrated Fluid energy, Segegrated flow, Gravity, Ideal Gas, 3D, Static, Gas.

I'm probably missing something simple, but any help would be great. Thanks.
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Old   June 21, 2005, 23:34
Default Re: CCM+ Natural convection
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som
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check gravity direction and run in double precision
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Old   June 22, 2005, 03:43
Default Re: CCM+ Natural convection
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Richard
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Wouldn't the temperature field in static air be much different to the one in moving air? So if you're getting the right temperature field, the air must be moving? Maybe it's just a post-processing glitch. Can you see that the velocity magnitude is exactly zero, or are the vector arrows just very short?
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Old   June 22, 2005, 05:04
Default Re: CCM+ Natural convection
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AJ
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The gravity is on, but not sure how to run the model in double precision in CCM+. Can you tell me? I've checked the postprocessing over and over, both graph plots and scalar/vector displays. Both read no velocity. Thanks guys
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Old   June 22, 2005, 05:50
Default Re: CCM+ Natural convection
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Richard
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You would need to download a separate double precision version. Have you tried the coupled solver instead of segregated?
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Old   June 22, 2005, 06:48
Default Re: CCM+ Natural convection
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AJ
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Coupled solver comes up with an error message, telling me: "Error: attempt to access nonexistant TemperatureSource field on cells" Does this mean anything to you?
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